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Seeing blue light8/27/2023 ![]() ![]() Some digital devices now offer blue light-filtering settings that reduce the transmission of short wavelengths of light. These products decrease the transmission of ultraviolet light involving wavelengths between 440 and 500 nanometers. Since 2008, research into blue-blocking or filtering products, such as blue-blocking glasses, has increased. Up to 69% of computer users report eyestrain, also known as computer vision syndrome. Research has suggested that excessive exposure to visible blue light also can cause eyestrain. However, at night, blue light exposure can potentially cause sleep issues by shifting your circadian rhythm, which is the body's internal clock. Fortunately, the level of blue light from these devices is significantly less than the levels of blue light in natural daylight. LEDs are used for the backlighting of computer screens, laptops, TVs and smartphones. LED and compact fluorescent lamps also give off blue light. In animal studies, prolonged exposure to natural blue light has been shown to damage the retina. Blue-light exposure can affect the retina - the layer of cells lining the back wall inside the eye that sense light and send signals to the brain so you can see.Įxposing the retina to shorter light wavelengths is the basis of "blue-light hazard" and contributes to phototoxicity or sensitivity to light. When the sun is shining, this is natural white light.īlue light has a shorter wavelength with higher energy: 400–500 nanometers. The others are red, orange, yellow, green, indigo and violet. Blue light is one of the colors in the visible light spectrum. ![]()
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